Improvement in rubber springs



,lilnited glatte ont com.

GEORGE WEAVER., AND H. NELSON ALLEN, OE BOSTON, MASSACHUSETTS, ASSIGNO'ES TO TH-EMSELVES AND E. E. CHENEY, OE SAME PLACE.

Letters Patent No. 92,236, dated .friuli/ 6, 1869.

./ IMPROVEMENT 1N RUBBER SPRINGS.

To all whom it may concern y Beit known `that we, GEORGE WEAVER and H. N ELsoN ALLEN, both of Boston, in the State of Mussa'chusctts, 'have invented a. new and useful Improvement in Rubber Springs foi-Valves antl'otherpnrposes; and we do hereby declare the following to be :t full, clean', und exact description of the same. v

The nature of our improvement consists informing rubber springs hollow, in such it mannerais to increase the elasticity, and ut the sztme tin'ie conse theui to tit moi-ie securely the objects upon which they are toghe use( We subjointhe further description of onrinvention,

to enable those skilled in the art to mnunfnctureand use the sinne, reference being hudto the accompanying druwings,in which- Figure l represents zt/sect'ion yof our improved rubber spring on theline y-y, fig. 2, und l Figure 2 shows u section of the Sinne ou the line l x-x, fig. 1.

A represents :t rubber spring.

B B shows :t hole extending through the spring.

Instcud ol' lthe hole B extending through in n. direct line,` forming the inner surface of n cylinder, it enlui'ges eqnatlly in ell directions from near the surface until it reaches the centre, where it commences to contract till it reaches near the opposite' side, forming :t cont tiuuons groove on the inner sui-thee, :is shown in the drawings, 1 und 2, thus mztking the spring hollow, as described.

upon either side ofthe knob or head,l thus preventing Y l the spring slipping. This spring muy be applied to any` useto which ordinary springs are applicable, and

lis not to be conlined to knobs or bends.

lt is especially adapted for valves of all kinds, and pistons, und the seats of ball-vulves, for the reasons stated, viz, the perfect manner in which it fits the object 4towhich it is applied,und the, increased elas- -ticity obtained by hollowing'it, :is set fort-11.

Having thus described our invention,

Wbut we claim Esnew, and for which we desire to secure Letters Potent, vis

The hollow rubber-spring or packing A, constructed with a. cylindrical' exterior, one or more upertures,

' and en internal cavity, C, increasing in dizuneter i'roin Y theendstoward the centre, substantially its and for the purpose described.

' GEGRGE WEAVER..

H. NELSON ALLEN.

Witnesses:

ETHAN R. CHENEY, WLLLARD LANE. 

